The germination energy test counts how many barley kernels germinate within a set time under standard conditions. Maltsters use it to judge whether a lot will sprout evenly in the malt house. A low result means dormant or damaged grain, and the lot may be sold as feed barley instead.
How it is measured
The European Brewery Convention methods place a counted number of kernels on filter paper with a set amount of water, usually 4 ml, and count germinated kernels over the following days. A parallel test with 8 ml of water shows water sensitivity: barley that germinates well in 4 ml but poorly in 8 ml needs a gentler steeping regime.
Energy versus capacity
Germinative capacity shows whether the embryo is alive at all, using forced germination or a staining test. Energy shows whether it is ready to grow now. High capacity with low energy means dormancy, which is common in fresh barley and passes with storage. Low capacity means damage, often from hot drying or poor storage.
In a contract
Maltsters usually set a high minimum for germination energy, name the EBC method and allow time for the test before acceptance. As indicative trade practice, many look for 95 per cent or more. The malting barley specification guide covers protein, screenings and variety, and the glossary entry on germination energy gives the short definition.